For the first 6 members in the series of alkenes ,polt the number of carbon atoms on one axis and the number of hydrogen atoms on the other axis. Use this graph to derive the formula of the alkene that has 10 carbon atoms. please help!

Asolution has a ca2+ concentration of 0.049 m and an f- concentration is 0.147 m at equilibrium. the value of ksp for caf2 at 25°c is 4.0 x 10-11. will this solution form a precipitate? yes no

Using a value of ksp = 1.8 x 10-2 for the reaction pbcl2 pb+2(aq) + 2cl -(aq). if the value of ksp was determined to be only 1.2 x 10-2: too much solid has dissolved. additional precipitate is forming. the solution is unsaturated. the ions are now combining to reduce their concentrations.

Can someone me with 1 to 4 plz. fast